A 500 mm square concrete column carries a factored ultimate vertical column load of
780 kN. The vertical service load is 650 kN. It is to be supported on a square footing with
f′c = 17 MPa and fy = 420 MPa. The soil has an allowable bearing pressure for bearing capacity of 650 kPa (based on LRFD methods) and an allowable bearing stress for settlement of
160 kPa. The groundwater table is at a great depth. Determine the required footing width, thickness, size of the flexural reinforcement, and show your design in a sketch.
10.10 A 16 in square concrete column carries factored ultimate column loads of PU = 370 k and
MU = 70 k@ft. The vertical service load is 310 k. The footing will be made of concrete with
f′c = 3,000 lb/in2
and reinforcing steel with fy = 60 k/in2
. The soil has an allowable bearing pressure for bearing capacity of 8,200 lb/ft2
(based on LRFD methods) and an allowable
bearing stress for settlement of 5,400 lb/ft2
. The groundwater table is at a great depth. Determine the required footing, width, thickness, size of the flexural reinforcement, and show your
design in a sketch.
